PHP Symbols>, => and:-php Tutorial

The symbols-& gt;, & gt; and: in PHP do not matter. let's explain in detail. if you have C ++ and Perl basics, you will find that these guys are similar to some of their symbol functions.

'->' Indicates the "infix dereference operator)

In other words, it is a method that calls a subroutine that passes parameters by reference (of course, there are other functions ). As we mentioned above, most parameters are passed through reference when calling PHP functions. The '->' function in PHP is the same as that in Perl or C ++. The following is a simple example of unreferencing:

Echo $ x-> def (); # output

　　

　The '=>' operator is common in PHP scripts. Because php array functions are rich, we often need to use arrays because it is very convenient to operate data.

$ Phparr = new array (in => 'Reply ,'

Side => 'left ',

Padx => 2 m,

Pady => 2 m,

Ipadx => 2 m,

Ipady => 1 m

)

By the way, if you need to use the digit "greater than or equal to", you should use "> =" instead of "=> ".

In PHP, ":" is called the range resolution operator and the domain name operator.

The ":" symbol can be considered to be similar to the "." symbol in C language, and it is more like the: class range operator in C ++ (Perl.

The internal static member of the php call class, or the call between classes, should be used ::

The following is an example:

Class

{

Static $ count = 0;

Static function haha ()

{

//

}

Function diaoyoug ()

{

Self: haha ();

Self: $ count;

}

}

A. B. c;/* c */

A: B: c (); // functions in C ++

$ A: B: c; # scalar in Perl 5